Luck is a major factor in gambling even in sports betting wherein knowledge is an edge. Many gamblers spend their money to bet in sports but only few are fortunate to win a decent amount. Anticipating to become rich is understandable, but keep in mind that even rich people can also lose their wealth in gambling if they're not wise.
Gambling relies heavily on luck, and the better gamblers understand this, the more they can control themselves. In sports betting, even after using knowledge and research to place bets, the results can be the opposite because sports are often unpredictable. If a rich person is not very serious about his wealth and always gives the highest importance to gambling, then it can create a bad situation for him. So it is true that a rich person can lose everything if he is not serious.